US8950190B2 - Gas turbine combustor having contraction member on inner wall surface - Google Patents

Gas turbine combustor having contraction member on inner wall surface Download PDF

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US8950190B2
US8950190B2 US13/388,204 US201013388204A US8950190B2 US 8950190 B2 US8950190 B2 US 8950190B2 US 201013388204 A US201013388204 A US 201013388204A US 8950190 B2 US8950190 B2 US 8950190B2
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combustion
air
wall surface
contraction member
combustion chamber
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US20120125006A1 (en
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Keijiro Saito
Shinji Akamatsu
Kenji Sato
Shigemi Mandai
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Mitsubishi Power Ltd
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Mitsubishi Heavy Industries Ltd
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Assigned to MITSUBISHI HITACHI POWER SYSTEMS, LTD. reassignment MITSUBISHI HITACHI POWER SYSTEMS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MITSUBISHI HEAVY INDUSTRIES, LTD.
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Assigned to MITSUBISHI POWER, LTD. reassignment MITSUBISHI POWER, LTD. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVING PATENT APPLICATION NUMBER 11921683 PREVIOUSLY RECORDED AT REEL: 054975 FRAME: 0438. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/04—Air inlet arrangements
    • F23R3/06—Arrangement of apertures along the flame tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
    • F23R3/46—Combustion chambers comprising an annular arrangement of several essentially tubular flame tubes within a common annular casing or within individual casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/12—Cooling of plants
    • F02C7/16—Cooling of plants characterised by cooling medium
    • F02C7/18—Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/03045—Convection cooled combustion chamber walls provided with turbolators or means for creating turbulences to increase cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers

Definitions

  • the present invention relates to a gas turbine combustor that supplies fuel to compressed gas and mixes the fuel with the compressed gas, and burns the mixed gas to obtain combustion gas, and to a gas turbine that drives a turbine by combustion gas from the gas turbine combustor to obtain rotational power.
  • a gas turbine includes a compressor, a combustor, and a turbine. Air is taken in from an air inlet and compressed by a compressor, and then the air becomes high-temperature and high-pressure compressed air. In the combustor, fuel is supplied to the compressed air to burn the fuel, so that high-temperature and high-pressure combustion gas is obtained. The turbine is then driven by the combustion gas to drive a generator connected to the turbine.
  • Patent Literature 1 As a technique for solving such a problem, for example, there is a technique described in Patent Literature 1 mentioned below.
  • a gas turbine combustor described in Patent Literature 1 a ring-shaped contraction member in a frustoconical shape is mounted concentrically on an inner cylinder wall at the back of the combustor. Therefore, film air flows toward a central part by the contraction member and is mixed with high-temperature combustion gas to promote a combustion reaction, thereby enabling to suppress generation of carbon monoxide and unburned hydrocarbon.
  • the present invention has been achieved to solve the above problems, and an object of the present invention is to provide a gas turbine combustor and a gas turbine that can suppress generation of carbon monoxide and suppress the occurrence of unstable combustion.
  • a gas turbine combustor includes: a combustion chamber in which high-pressure air and fuel are burned to generate combustion gas; a combustion high-pressure-air supplying unit that supplies combustion high-pressure air to the combustion chamber; a fuel supplying unit that supplies fuel to high-temperature air in the combustion chamber; a cooling-air supplying unit that supplies cooling air to the combustion chamber along an inner wall surface thereof; and a contraction member arranged along a circumferential direction on an inner wall surface in a downstream of a flow direction of combustion gas in the combustion chamber.
  • the contraction member is provided in a predetermined area in a circumferential direction excluding penetrating portions, which do not disturb flow of cooling air.
  • the contraction member is divided in plural through the penetrating portions and arranged in a circumferential direction.
  • the contraction members are provided at asymmetric positions with respect to a circumferential direction on the inner wall surface of the combustion chamber.
  • the contraction member has a corner portion protruding toward a central part of the combustion chamber.
  • the contraction member is provided in plural in a flow direction of combustion gas.
  • a gas turbine supplies fuel to compressed air compressed by a compressor to burn fuel in a combustor, and supplies generated combustion gas to a turbine to obtain rotational power.
  • the combustor includes a combustion chamber, a combustion high-pressure-air supplying unit that supplies combustion high-pressure air to the combustion chamber, a fuel supplying unit that supplies fuel to high-temperature air in the combustion chamber, a cooling-air supplying unit that supplies cooling air to the combustion chamber along an inner wall surface thereof, and a contraction member arranged along a circumferential direction on an inner wall surface in a downstream of a flow direction of combustion gas in the combustion chamber.
  • the contraction member is provided in a predetermined area in a circumferential direction excluding penetrating portions, which do not disturb flow of cooling air.
  • a combustion high-pressure-air supplying unit that supplies combustion high-pressure air to a combustion chamber
  • a fuel supplying unit that supplies fuel to high-temperature air in the combustion chamber
  • a cooling-air supplying unit that supplies cooling air to the combustion chamber along an inner wall surface
  • a contraction member arranged along a circumferential direction on the inner wall surface in a downstream of a flow direction of combustion gas in the combustion chamber.
  • the contraction member is provided in a predetermined area in the circumferential direction excluding penetrating portions, which do not disturb the flow of cooling air.
  • the flow of cooling air is disturbed by the contraction member so that cooling air flows toward a central part. Furthermore, cooling air that flows in from a downstream of the contraction member is also disturbed by the disturbance caused by the contraction member. Therefore, cooling air is mixed with high-temperature combustion gas to promote a combustion reaction, thereby enabling to suppress generation of carbon monoxide and unburned hydrocarbon.
  • the flow of cooling air is not disturbed and cooling air flows along the inner wall surface. Accordingly, abnormal combustion of unburned premixed gas can be prevented, and the instability of swirl can be avoided by the presence of the penetrating portions. As a result, generation of unstable combustion can be suppressed.
  • the contraction member is divided in plural through penetrating portions and arranged in a circumferential direction, combustion is not excessively promoted in the penetrating portions, thereby enabling to suppress generation of unstable combustion.
  • the contraction members are provided at asymmetric positions with respect to the circumferential direction on the inner wall surface of the combustion chamber, a flame pattern becomes unbalanced with respect to the circumferential direction. Therefore, the temperature distribution in the circumferential direction in the combustion chamber changes, and thus an excitation force that generates unstable vibration in an axial direction can be reduced.
  • cooling air generates swirl at the corner portions of the contraction member, thereby enabling to promote mixing of combustion gas and cooling air.
  • the gas turbine combustor of the present invention because a plurality of contraction members are arranged in the flow direction of combustion gas, heat generation by the contraction members can be dispersed, and generation of carbon monoxide and unburned hydrocarbon can be suppressed.
  • the gas turbine includes a compressor, a combustor, and a turbine, and as the combustor, a combustion high-pressure-air supplying unit that supplies combustion high-pressure air to a combustion chamber, a fuel supplying unit that supplies fuel to high-temperature air in the combustion chamber, a cooling-air supplying unit that supplies cooling air to the combustion chamber along an inner wall surface, and a contraction member arranged along a circumferential direction on the inner wall surface in a downstream of a flow direction of combustion gas in the combustion chamber are provided.
  • the contraction member is provided in a predetermined area in the circumferential direction excluding penetrating portions, which do not disturb the flow of cooling air.
  • the flow of cooling air is disturbed by the contraction member so that cooling air flows toward a central part. Furthermore, a mixing promotion effect by the disturbance can be expected with respect to cooling air flowing in from a downstream of the contraction member. Therefore, cooling air is mixed with high-temperature combustion gas to promote a combustion reaction, thereby enabling to suppress generation of carbon monoxide and unburned hydrocarbon.
  • the flow of cooling air is not disturbed and cooling air flows along the inner wall surface. Accordingly, abnormal combustion of unburned premixed gas can be prevented, and the instability of swirl can be avoided by the presence of the penetrating portions. As a result, generation of unstable combustion can be suppressed.
  • FIG. 1 is a schematic diagram of inside of a transition piece in a gas turbine combustor according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view along a line II-II in FIG. 1 .
  • FIG. 3 is a cross-sectional view along a line III-III in FIG. 2 .
  • FIG. 4 is a graph representing a heat rate at an axial-direction position in the gas turbine combustor according to the first embodiment.
  • FIG. 5 is a schematic diagram of a gas turbine according to the first embodiment.
  • FIG. 6 is a schematic diagram of a cross section of a gas turbine combustor according to a second embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a cross section of a gas turbine combustor according to a third embodiment of the present invention.
  • FIG. 8 is a schematic diagram of inside of a transition piece in a gas turbine combustor according to a fourth embodiment of the present invention.
  • FIG. 9 is a cross-sectional view along a line IX-IX in FIG. 8 .
  • FIG. 1 is a schematic diagram of inside of a transition piece in a gas turbine combustor according to a first embodiment of the present invention
  • FIG. 2 is a cross-sectional view along a line II-II in FIG. 1
  • FIG. 3 is a cross-sectional view along a line III-III in FIG. 2
  • FIG. 4 is a graph representing a heat rate at an axial-direction position in the gas turbine combustor according to the first embodiment
  • FIG. 5 is a schematic diagram of a gas turbine according to the first embodiment.
  • the gas turbine according to the first embodiment includes a compressor 11 , a combustor 12 , and a turbine 13 .
  • a generator (not shown) is connected to the gas turbine 13 so that power can be generated.
  • the compressor 11 includes an air inlet 21 that takes in air, and in the compressor 11 , a plurality of compressor vanes 23 and rotor blades 24 are arranged alternately in a longitudinal direction (an axial direction of a rotor 32 described later) in a compressor casing 22 , and a bleed air chamber 25 is provided outside thereof.
  • the combustor 12 supplies fuel to compressed air compressed by the compressor 11 to burn fuel by ignition.
  • a plurality of nozzles 27 and rotor blades 28 are arranged alternately in the longitudinal direction (the axial direction of the rotor 32 described later) in a turbine casing 26 .
  • An exhaust chamber 30 is arranged on a downstream side of the turbine casing 26 through penetrating portions an exhaust casing 29 , and the exhaust chamber 30 includes an exhaust diffuser 31 connected to the turbine 13 .
  • the rotor (turbine shaft) 32 is positioned to penetrate the center of the compressor 11 , the combustor 12 , the turbine 13 , and the exhaust chamber 30 .
  • An end of the rotor 32 on a side of the compressor 11 is rotatably supported by a bearing 33
  • the other end on a side of the exhaust chamber 30 is rotatably supported by a bearing 34 .
  • a plurality of disks on which the respective rotor blades 24 are mounted are overlapped and fixed to the rotor 32 in the compressor 11
  • a plurality of disks on which the respective rotor blade 28 are mounted are overlapped and fixed to the rotor 32 in the turbine 13 .
  • a drive shaft of a generator (not shown) is connected to the end of the rotor 32 on a side of the exhaust chamber 30 .
  • the compressor casing 22 of the compressor 11 is supported by a leg 35
  • the turbine casing 26 of the turbine 13 is supported by a leg 36
  • the exhaust chamber 30 is supported by a leg 37 .
  • air taken in from the air inlet 21 of the compressor 11 is compressed while passing through the compressor vanes 23 and the rotor blades 24 so as to become high-temperature and high-pressure compressed air.
  • predetermined fuel is supplied to the compressed air to burn.
  • High-temperature and high-pressure combustion gas which is a working fluid generated by the combustor 12 , passes through the nozzles 27 and the rotor blades 28 that constitute the turbine 13 to rotate the rotor 32 , thereby driving the generator connected to the rotor 32 .
  • the energy of flue gas (combustion gas) is converted to a pressure by the exhaust diffuser 31 in the exhaust chamber 30 , and is decelerated and discharged to the atmosphere.
  • an inner cylinder 42 is supported in an outer casing 41 with a predetermined gap, and a transition piece 43 is connected to an apical end of the inner cylinder 42 to constitute a combustor casing.
  • a pilot nozzle 44 is arranged at the center of the inner cylinder 42 , and a plurality of main fuel nozzles (premixing nozzles) 45 are arranged to surround the pilot nozzle 44 on an inner periphery of the inner cylinder 42 in a circumferential direction thereof.
  • a pilot cone 46 is mounted on an apical end of the pilot nozzle 44 .
  • a plurality of top hat nozzles 47 are arranged on an inner periphery of the outer casing 41 along the circumferential direction thereof.
  • an outer casing lid 52 is attached firmly to a base end of an outer casing body 51 and fastened by a plurality of fastening bolts 53 to constitute the outer casing 41 .
  • a base end of the inner cylinder 42 is fitted to the outer casing lid 52 so as to form an air passage 54 between the outer casing lid 52 and the inner cylinder 42 .
  • the pilot nozzle 44 is arranged at the center of the inner cylinder 42
  • the main fuel nozzles 45 are arranged to surround the pilot nozzle 44
  • the apical ends of the respective main fuel nozzles 45 are connected to a main burner 55 .
  • a top hat part 56 is fitted to the outer casing lid 52 and is fastened by a plurality of fastening bolts 57 .
  • the top hat nozzle 47 described above is provided in the top hat part 56 . That is, a fuel cavity 58 is formed in a base end of the top hat part 56 along the circumferential direction, a plurality of fuel passages 59 are formed from the fuel cavity 58 toward the apical end, and an injection port 60 is connected to an apical end of each of the fuel passages 59 .
  • a pilot fuel line (not shown) is then connected to a fuel port 61 of the pilot nozzle 44 , a main fuel line is connected to a fuel port 62 of the main fuel nozzle 45 , and a top-hat fuel line is connected to a fuel port 63 of the top hat nozzle 47 .
  • openings 64 that take in high-pressure air from outside and cool the high-pressure air by causing the high-pressure air to flow along the inner periphery of the inner cylinder 42 as film air on an outer periphery of the inner cylinder 42 .
  • a combustion chamber of the present invention is constituted by the inner cylinder 42 and the transition piece 43
  • a combustion high-pressure-air supplying unit is constituted by the air passage 54
  • a fuel supplying unit according to the present invention is constituted by the pilot nozzle 44 , the main fuel nozzle 45 , and the top hat nozzle 47
  • a cooling-air supplying unit according to the present invention is constituted by the openings 64 .
  • the compressed air is mixed with fuel injected from the top hat nozzle 47 , and an air-fuel mixture flows into the inner cylinder 42 .
  • the air-fuel mixture is mixed with fuel injected from the main fuel nozzle 45 by the main burner 55 , and becomes a swirling current of premixed gas to flow into the transition piece 43 .
  • the air-fuel mixture is then mixed with fuel injected from the pilot nozzle 44 , burned by being ignited by a pilot burner (not shown) so as to become combustion gas, and ejected into the transition piece 43 .
  • a part of the combustion gas is ejected to diffuse in a surrounding area in the transition piece 43 with flame, and the combustion gas is ignited by premixed gas flowing from the respective main fuel nozzles 45 into the transition piece 43 and burns. That is, flame-holding for performing stable combustion of lean premixed fuel from the main fuel nozzle 45 can be performed by diffused flame of the pilot fuel injected from the pilot nozzle 44 . Further, airflow of high-temperature and high-pressure compressed air is taken in from the openings 64 and flows along the inner wall surfaces of the inner cylinder 42 and the transition piece 43 to be cooled. Accordingly, a temperature increase of the inner cylinder 42 and the transition piece 43 due to combustion gas can be suppressed.
  • three contraction members 71 , 72 , and 73 are arranged along a circumferential direction of the inner cylinder 42 on an inner wall surface in a downstream of a flow direction of combustion gas in the inner cylinder 42 .
  • the contraction members 71 , 72 , and 73 are provided in a predetermined area in the circumferential direction excluding penetrating portions 74 , 75 , and 76 , which do not disturb the flow of film air (cooling air).
  • the respective contraction members 71 , 72 , and 73 have substantially the same shape, with a cross section thereof being an L-shape.
  • a base end of each of these contraction members is fixed to the inner wall surface of the inner cylinder 42 by welding (or a bolt) 77 , and an apical end thereof is supported by a support member 78 with a predetermined gap from the inner wall surface of the inner cylinder 42 . Therefore, in the respective contraction members 71 , 72 , and 73 , a guide surface inclined by a predetermined angle ⁇ is formed to cause film air flowing on the inner wall surface of the inner cylinder 42 to flow toward the central part of the inner cylinder 42 .
  • the contraction members 71 , 72 , and 73 respectively include corner portions 71 a and 71 b , 72 a and 72 b , 73 a and 73 b protruding toward the central part of the inner cylinder 42 .
  • the penetrating portions 74 , 75 , and 76 are positioned between the respective contraction members 71 , 72 , and 73 , and have substantially the same shape. That is, the contraction members 71 , 72 , and 73 are provided through the penetrating portions 74 , 75 , and 76 , namely, the contraction members 71 , 72 , and 73 and the penetrating portions 74 , 75 , and 76 are divided in plural (three in the present embodiment) in the circumferential direction, and are arranged alternately in the circumferential direction. In this case, the contraction members 71 , 72 , and 73 are provided at asymmetric positions with respect to the circumferential direction on the inner wall surface of the inner cylinder 42 . However, the contraction members 71 , 72 , and 73 do not need to be provided at asymmetric positions in the circumferential direction and can be provided at symmetric positions.
  • combustion gas flows in the central part, and film air flows along the inner wall surface of the outer periphery.
  • the flow of combustion gas is disturbed so that film air flows from the contraction members 71 , 72 , and 73 toward the central part.
  • the flow of cooling air flowing in from the downstream of the contraction members 71 , 72 , and 73 is disturbed by the contraction members 71 , 72 , and 73 . Therefore, film air is mixed with high-temperature combustion gas to promote a combustion reaction, thereby suppressing generation of carbon monoxide and unburned hydrocarbon.
  • the respective contraction members 71 , 72 , and 73 are divided in plural, and they include the corner portions 71 a and 71 b , 72 a and 72 b , 73 a and 73 b , respectively, film air, the flow of which has been disturbed by the contraction members 71 , 72 , and 73 , also causes effects on film air passing through the penetrating portions 74 , 75 , and 76 , and thus generation of carbon monoxide and unburned hydrocarbon and an increase in combustion gas temperature are effectively suppressed.
  • FIG. 4 is a graph representing a heat rate with respect to a distance from a base end to an apical end in the combustor 12 .
  • the heat rate becomes highest in the middle part.
  • the heat rate excessively increases immediately after the position of the contraction member.
  • the combustor 12 in which the contraction members 71 , 72 , and 73 according to the first embodiment are provided as shown by the one-dot chain line in FIG. 4 , the highest value of the heat rate is lower than that of the above conventional combustor.
  • the contraction members 71 , 72 , and 73 are provided at asymmetric positions with respect to the circumferential direction on the inner wall surface of the inner cylinder 42 , the flame pattern becomes unbalanced with respect to the circumferential direction, and the length of a flame sheet in an axial direction in this portion changes.
  • the temperature distribution in an area where the contraction members 71 , 72 , and 73 are provided and in an area where the penetrating portions 74 , 75 , and 76 are provided changes along with the circumferential direction, and an excitation force that generates unstable vibration in the axial direction of the combustor is reduced.
  • the flame has an asymmetrical distribution with respect to the circumferential direction, generation of a vibration mode in which “+” and “ ⁇ ” are inverted is suppressed in a vibration mode in the cross section.
  • the contraction members 71 , 72 , and 73 are provided at asymmetric positions in the circumferential direction.
  • the asymmetric positions with respect to the circumferential direction are positions at which a diameter line (a node at which the phase is inverted) cannot be drawn in the vibration mode in which a cross section of the inner cylinder 42 is uniformly divided into even numbers.
  • it is set at a position where the contraction members 71 , 72 , and 73 are not overlapped in the circumferential direction and are not in point symmetry with respect to the center of the inner cylinder 42 . That is, in the present embodiment, the contraction members 71 , 72 , and 73 (the penetrating portions 74 , 75 , and 76 ) are set at positions away from each other by 120 degrees in the circumferential direction.
  • the air passage 54 that supplies combustion high-pressure air, the pilot nozzle 44 , the main fuel nozzle 45 , and the top hat nozzle 47 that supply fuel, and the openings 64 that supplies film air (cooling air) are provided with respect to the inner cylinder 42 .
  • the contraction members 71 , 72 , and 73 are arranged along the circumferential direction on the inner wall surface in the downstream of the flow direction of combustion gas in the inner cylinder 42 , and provided in a predetermined area in the circumferential direction excluding the penetrating portions 74 , 75 , and 76 , which do not disturb the flow of film air.
  • the flow of film air is disturbed by the contraction members 71 , 72 , and 73 so that film air flows toward a central part.
  • the flow of cooling air flowing from the downstream of the contraction members 71 , 72 , and 73 is also disturbed by the contraction members 71 , 72 , and 73 , and thus cooling air is mixed with high-temperature combustion gas, thereby enabling to promote a combustion reaction and to suppress generation of carbon monoxide and unburned hydrocarbon.
  • the contraction members 71 , 72 , and 73 are divided into three through the penetrating portions 74 , 75 , and 76 and arranged in the circumferential direction. Therefore, the gap between the contraction members 71 , 72 , and 73 and the penetrating portions 74 , 75 , and 76 becomes short, thereby enabling to prevent abnormal combustion of unburned premixed gas and to avoid the instability of swirl by the presence of the penetrating portions 74 , 75 , and 76 .
  • the contraction members 71 , 72 , and 73 are provided at the asymmetric positions with respect to the circumferential direction on the inner wall surface of the inner cylinder 42 . Therefore, the flame pattern becomes unbalanced with respect to the circumferential direction, and the temperature distribution in the inner cylinder 42 changes along with the circumferential direction, thereby enabling to suppress generation of a vibration mode and to suppress generation of unstable combustion.
  • the contraction members 71 , 72 , and 73 respectively include the corner portions 71 a and 71 b , 72 a and 72 b , and 73 a and 73 b protruding toward the central part of the combustion chamber. Accordingly, film air generates swirl at the corner portions 71 a and 71 b , 72 a and 72 b , and 73 a and 73 b of the contraction members 71 , 72 , and 73 , thereby promoting mixing of combustion gas with cooling air.
  • the contraction members 71 , 72 , and 73 have the same shape and the penetrating portions 74 , 75 , and 76 also have the same shape, and these elements are arranged with an equal gap in the circumferential direction.
  • these elements can be also arranged asymmetrically by changing the circumferential length of the contraction members 71 , 72 , and 73 and the penetrating portions 74 , 75 , and 76 , by changing a protruding amount of the contraction members 71 , 72 , and 73 toward the central part, or by changing the gap in the circumferential direction.
  • FIG. 6 is a schematic diagram of a cross section of a gas turbine combustor according to a second embodiment of the present invention. Members having functions identical to those explained in the above embodiment are denoted by like reference signs and redundant explanations thereof will be omitted.
  • contraction members 81 and 82 are arranged along a circumferential direction of the inner cylinder 42 on an inner wall surface in a downstream of a flow direction of combustion gas in the inner cylinder 42 .
  • the contraction members 81 and 82 are provided in a predetermined area in the circumferential direction excluding penetrating portions 83 and 84 , which do not disturb the flow of film air (cooling air).
  • the contraction members 81 and 82 respectively have a different length in the circumferential direction, and include corner portions 81 a and 81 b , 82 a and 82 b , respectively, that protrude toward a central part of the inner cylinder 42 .
  • the penetrating portions 83 and 84 are positioned between the respective contraction members 81 and 82 , and have a different length in the circumferential direction. That is, the contraction members 81 and 82 are divided in plural through the penetrating portions 83 and 84 and arranged in the circumferential direction. In this case, the contraction members 81 and 82 and the penetrating portions 83 and 84 are provided at the asymmetric positions with respect to the circumferential direction on the inner wall surface of the inner cylinder 42 .
  • combustion gas flows in the central part, and film air flows along the inner wall surface of an outer periphery.
  • film air flows along the inner wall surface of an outer periphery.
  • the contraction members 81 and 82 and the penetrating portions 83 and 84 are provided asymmetrically with respect to the circumferential direction on the inner wall surface of the inner cylinder 42 , a flame pattern becomes unbalanced with respect to the circumferential direction, and the length of a flame sheet in an axial direction in this portion changes. Therefore, the temperature distribution in the area where the contraction members 81 and 82 are provided and in the area where the penetrating portions 83 and 84 are provided changes along with the circumferential direction, and an excitation force that generates unstable vibration in the axial direction of the combustor is reduced.
  • the two contraction members 81 and 82 are arranged along the circumferential direction on the inner wall surface of the inner cylinder 42 in the downstream of the flow direction of combustion gas, and the contraction members 81 and 82 are provided in a predetermined area in the circumferential direction excluding the penetrating portions 83 and 84 , which do not disturb the flow of film air.
  • FIG. 7 is a schematic diagram of a cross section of a gas turbine combustor according to a third embodiment of the present invention.
  • Members having functions identical to those explained in the above embodiments are denoted by like reference signs and redundant explanations thereof will be omitted.
  • contraction members 91 to 98 are arranged along a circumferential direction of the inner cylinder 42 on an inner wall surface in a downstream of a flow direction of combustion gas in the inner cylinder 42 .
  • the contraction members 91 to 98 are provided in a predetermined area in the circumferential direction excluding penetrating portions 101 to 108 , which do not disturb the flow of film air (cooling air).
  • the respective contraction members 91 to 98 have the same shape
  • the penetrating portions 101 to 108 also have the same shape
  • these elements are provided with an equal gap in the circumferential direction.
  • These elements can be provided at asymmetric positions with respect to the circumferential direction, by changing the shape, length, arrangement or the like as required.
  • combustion gas flows in the central part, and film air flows along the inner wall surface of an outer periphery.
  • film air flows along the inner wall surface of an outer periphery.
  • the eight contraction members 91 to 98 are arranged along the circumferential direction on the inner wall surface of the inner cylinder 42 in the downstream of the flow direction of combustion gas, and the contraction members 91 to 98 are provided in a predetermined area in the circumferential direction excluding the penetrating portions 101 to 108 , which do not disturb the flow of film air.
  • FIG. 8 is a schematic diagram of inside of a transition piece in a gas turbine combustor according to a fourth embodiment of the present invention
  • FIG. 9 is a cross-sectional view along a line IX-IX in FIG. 8 .
  • Members having functions identical to those explained in the above embodiments are denoted by like reference signs and redundant explanations thereof will be omitted.
  • three contraction members 111 , 112 , and 113 are arranged along a circumferential direction of the inner cylinder 42 on an inner wall surface in a downstream of a flow direction of combustion gas in the inner cylinder 42 .
  • the contraction members 111 , 112 , and 113 are provided in a predetermined area in the circumferential direction excluding penetrating portions 114 , 115 , and 116 , which do not disturb the flow of film air (cooling air).
  • the respective contraction members 111 , 112 , and 113 have substantially the same length in the circumferential direction, and are provided while being shifted in the flow direction of combustion gas, and are provided while also being shifted in the circumferential direction.
  • the three contraction members 111 , 112 , and 113 are arranged so that a part thereof overlaps on each other with respect to the flow direction of combustion gas.
  • the penetrating portions 114 , 115 , and 116 are shifted in the circumferential direction of the respective contraction members 111 , 112 , and 113 and positioned at the same position with respect to the flow direction of combustion gas, with the circumferential length thereof being substantially the same.
  • the contraction members 111 , 112 , and 113 and the penetrating portions 114 , 115 , and 116 are provided at asymmetric positions with respect to the circumferential direction on the inner wall surface of the inner cylinder 42 .
  • combustion gas flows in the central part, and film air flows along the inner wall surface of an outer periphery.
  • film air flows along the inner wall surface of an outer periphery.
  • the contraction members 111 , 112 , and 113 and the penetrating portions 114 , 115 , and 116 are provided asymmetrically with respect to the circumferential direction on the inner wall surface of the inner cylinder 42 , a flame pattern becomes unbalanced with respect to the circumferential direction, and the length of a flame sheet in an axial direction in this portion changes. Therefore, the temperature distribution in the area where the contraction members 111 , 112 , and 113 are provided and in an area where the penetrating portions 114 , 115 , and 116 are provided changes along with the circumferential direction, and an excitation force that generates unstable vibration in the axial direction of the combustor is reduced.
  • the three contraction members 111 , 112 , and 113 are arranged along the circumferential direction on the inner wall surface of the inner cylinder 42 in the downstream of the flow direction of combustion gas, and the contraction members 111 , 112 , and 113 are provided while being shifted in the circumferential direction and in the axial direction of the inner cylinder 42 , and the contraction members 111 , 112 , and 113 are provided in a predetermined area in the circumferential direction excluding the penetrating portions 114 , 115 , and 116 , which do not disturb the flow of film air.
  • the flow of film air is disturbed by the contraction members 111 , 112 , and 113 and film air is mixed with high-temperature combustion gas to promote a combustion reaction, thereby suppressing generation of carbon monoxide and unburned hydrocarbon.
  • abnormal combustion of unburned premixed gas is prevented by the penetrating portions 101 to 108 , and the instability of swirl is avoided by the presence of the penetrating portions 114 , 115 , and 116 to suppress generation of unstable combustion.
  • the contraction members are configured to have a shape with corner portions protruding toward the central part of the combustion chamber; however, the shape of the contraction member is not limited thereto.
  • a semicircular board can be fixed to the inner wall surface of the combustion chamber, and the contraction member does not particularly need to have a shape having corner portions.
  • the position at which the contraction member is arranged is not limited to the inner cylinder 42 positioned immediately below the respective nozzles 44 , 45 , and 47 , and the contraction member can be provided in the transition piece 43 , and the arrangement is not limited to be symmetrical and asymmetrical.
  • a contraction member is provided in a predetermined area in a circumferential direction excluding penetrating portions, which do not disturb the flow of cooling air, thereby enabling to suppress generation of carbon monoxide and the like and to suppress generation of unstable combustion. Accordingly, the gas turbine combustor and the gas turbine can be also applied to any types of combustors and gas turbines.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
US13/388,204 2009-11-10 2010-11-05 Gas turbine combustor having contraction member on inner wall surface Active 2031-07-11 US8950190B2 (en)

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JP2009257360A JP2011102669A (ja) 2009-11-10 2009-11-10 ガスタービン燃焼器及びガスタービン
JP2009-257360 2009-11-10
PCT/JP2010/069740 WO2011058931A1 (ja) 2009-11-10 2010-11-05 ガスタービン燃焼器及びガスタービン

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EP (1) EP2500655B1 (de)
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Publication number Priority date Publication date Assignee Title
US10995956B2 (en) 2016-03-29 2021-05-04 Mitsubishi Power, Ltd. Combustor and method for improving combustor performance
DE112017001792B4 (de) * 2016-03-29 2021-07-01 Mitsubishi Power, Ltd. Brennkammer und Verfahren zur Verbesserung der Brennkammerleistung

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EP2500655A4 (de) 2014-12-03
US20120125006A1 (en) 2012-05-24
CN102472493B (zh) 2014-10-01
CN102472493A (zh) 2012-05-23
JP2011102669A (ja) 2011-05-26
KR101412237B1 (ko) 2014-06-25
KR20120041741A (ko) 2012-05-02
WO2011058931A1 (ja) 2011-05-19
EP2500655A1 (de) 2012-09-19

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